Chemistry
You are supplied with five solutions : A, B, C, D and E with pH values as follows:
A = 1.8, B = 7, C = 8.5, D = 13, and E = 5
Classify these solutions as neutral, slightly or strongly acidic and slightly or strongly alkaline.
Which solution would be most likely to liberate hydrogen with:
(a) magnesium powder
(b) powdered zinc metal. Give a word equation for each reaction.
Answer
A = Strongly acidic
B = neutral
C = slightly alkaline
D = Strongly alkaline
E = slightly acidic
(a) Solution A (acidic solution)
Solution A (acidic solution) + magnesium powder ⟶ Hydrogen + Mg salt
(b) Solution A (acidic solution)
Solution A (acidic solution) + powdered zinc metal ⟶ Hydrogen + Zn salt
Related Questions
How does tooth enamel get damaged? What should be done to prevent it?
When you use a universal indicator, you see that solutions of different acids produce different colours. Indeed, solutions of the same acid with different concentrations will also give different colours. Why?
Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2.
Which solution:
(a) Will liberate ammonia from ammonium sulphate on heating.
(b) is a strong acid?
(c) contains molecules as well as ions?
Select the word/s given below which are required to correctly complete the blanks — [ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt water] :
(i) A solution M turns blue litmus red, so it must contain (i) …………… ions ; another solution O turns red litmus blue and hence, must contain, (ii) …………… ions.
(ii) When solution M and O are mixed together, the products will be (iii) …………… and (iv) …………… .
(iii) If a piece of magnesium was put into a solution M,(v) …………… gas would be evolved.